I got a 2004 chevy venture about 110 km an hour you can feel the whole body vibrate dont know what causing it , hopefully you can help me to solve this problem.

have the cv joints checked as altering the engine position may put the load in a different wear position

Have you taken the van anywhere to have the body computer checked for trouble codes ?

FIRST YOU HAVE TO DRAIN COOLANT LEVEL BELOW THERMOSTAT THEN.TO REMOVE THERMOSTAT YOU HAVE TO REMOVE AIR FILTER DUCT AND MAF SENSOR TOGETHER.HAVE TO DISCONNECT ACCELERATOR CABLE AND TRANSMISSION SHIFT CABLE FROM THROTTLE BODY BRACKET. YOU HAVE TO REMOVE THROTTLE BODY UNIT REMOVE THE SMALL COOLANT HOSES FROM THROTTLE BODY,YOU NEED TO GO TO DEALERSHIP TO BUY THE SMALL COOLANT HOSES ATTACHED TO THE THROTTLE BODY.WHEN YOU REMOVE THE THROTLLE BODY UNIT.THEN YOU CAN REMOVE THERMOSTAT HOUSING TO REPLACE THERMOSTAT.YOU NEED TO BUY NEW THROTTLE BODY GASKET DONT REUSE OLD ONE.IF DO YOU WILL GET A VACUUM LEAK AND HAVE HIGH IDLE PROBLEM.

I don't think it would be so much the rear end problem. Either they are using are really cheap made wheel bearings or you have a caliper sticking which means the system may have air in the system or some sort of defective caliper. The same problem should not be returning unless the same part is being used such as a caliper. Also, you could have some bad bushings some where in the rear that cause a shift when applying brakes. Sorry I can't give any other help. It's easier to hear and see to help better. Good Luck

change trans fluid and filter and a fuel filter might not hert

Sounds like your tire(S) are out of balance.

open the door and look on the side of door for little switch up and down ,it a safety switch ,little gray lever sticking out on the side of doors, move it up or down ,read decal on the door jam,hope to help robert b.

Jack up the front end and put stands under it and block rear wheels. Look at axle boots and see if they are cracked. Try turning wheel back and forth sharply and see if you can hear any clicking. Problem could be outer axle joints. If the boots are cracked or you hear a clicking noise you will have to replace the axle. The axle and boot come as a complete unit. Please let me know what you find out.

no you dont need a special tool you have to take the throttle body off it makes it sooooooo much more simple.

I have a 2000 Brighton and had the same problem but opposite weather patterns. On humid days it would cut out. I changed the ignition coil and that solved it.